Subject
- Douglas fir -- Diseases and pests -- Montana3
- Douglas fir tussock moth -- Idaho2
- Douglas fir tussock moth -- Montana2
- Douglas fir tussock moth -- Washington (State)2
- Fluorides -- Environmental aspects -- Montana2
- Mountain pine beetle -- Montana -- Crow Indian Reservation2
- Mountain pine beetle -- Montana -- Lolo National Forest2
- Ponderosa pine -- Diseases and pests -- Montana -- Crow Indian Reservation2
- Western spruce budworm -- Montana2
- Abies lasiocarpa -- Diseases and pests -- Montana -- Big Belt Mountains1
- Abies lasiocarpa -- Diseases and pests -- Montana -- Gallatin National Forest1
- Aerial photography in forestry -- Idaho -- Coeur d'Alene National Forest1
- Aluminum plants -- Environmental aspects -- Montana1
- Atmospheric sulphur dioxide -- Environmental aspects -- Montana1
- Bark beetles -- Custer National Forest (Mont. and S.D.)1
- Bark beetles -- Montana -- Big Belt Mountains1
- Bark beetles -- Montana -- Lolo National Forest1
- Blister rust -- Yellowstone National Park1
- Borers (Insects) -- North Dakota -- Bowman County1
- Braconidae -- Northwest, Pacific1